Changeset e11ae91 in mainline for kernel/arch/sparc64/src/proc/scheduler.c

Timestamp:

2006-08-30T11:31:25Z (18 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

ee454eb

Parents:

0fa6044

Message:

sparc64 work.

• Modify before_thread_runs_arch() to store addresses of the kernel stack and

userspace window buffer, resp., to registers %g6 and %g7, resp, in the
alternate and interrupt global sets.

• Modify after_thread_ran_arch() to sample %g7 from the alternate globals.
• Implement trap handler for spilling register windows into userspace window buffer.
• Implement assembly language functions to access %g6 and %g7 registers in the alternate sets.
• Initialize the trap table so that there are now also spill_1_normal, spill_2_normal,

spill_0_other and fill_1_normal handlers. These handlers are used in different situations
and for different purposes.

File:

• kernel/arch/sparc64/src/proc/scheduler.c (modified) (4 diffs)

kernel/arch/sparc64/src/proc/scheduler.c

@@ -37 +37 @@
 #include <arch.h>
 #include <arch/asm.h>
+#include <arch/regdef.h>
+#include <arch/stack.h>
 #include <arch/mm/tlb.h>
 #include <arch/mm/page.h>
@@ -52 +54 @@
  * Ensure that thread's kernel stack, as well as userspace window
  * buffer for userspace threads, are locked in DTLB.
+ * For userspace threads, initialize reserved global registers
+ * in the alternate and interrupt sets.
  */
 void before_thread_runs_arch(void)
@@ -83 +87 @@
                         dtlb_insert_mapping(uw_buf, KA2PA(uw_buf), PAGESIZE_8K, true, true);
                 }
+                
+                /*
+                 * Write kernel stack address to %g6 and a pointer to the last item
+                 * in the userspace window buffer to %g7 in the alternate and interrupt sets.
+                 */
+                write_to_ig_g6((uintptr_t) THREAD->kstack + STACK_SIZE - STACK_BIAS);
+                write_to_ag_g6((uintptr_t) THREAD->kstack + STACK_SIZE - STACK_BIAS);
+                write_to_ag_g7((uintptr_t) THREAD->arch.uspace_window_buffer);
         }
 }
@@ -124 +136 @@
                         dtlb_demap(TLB_DEMAP_PAGE, TLB_DEMAP_NUCLEUS, (uintptr_t) uw_buf);
                 }
+        
+                /* sample the state of the userspace window buffer */   
+                THREAD->arch.uspace_window_buffer = (uint8_t *) read_from_ag_g7();
         }
 }